Lamp-holder of the edison type



A. PIAZZI. LAMP HOLDER OF THE EDISON TYPE.

APPLICATION FILED AUG.19, '19I8. RENEWED 1,362,734.

NOV. 11,1920.

Patented Dec. 21, 1920.

UNITED STATES PATENT OFFICE.

ANTONIO PIAZZI, OF GALLARATE, ITALY.

LAMP-HOLDER OF THE EDISON TYPE.

Application filed August 19, 1918, Serial No. 250,578. Renewed November 11, 1920. Serial No. 423,485.

To all whom it may concern Be it known that I ANTONIO PIAZZI, residing at Via Como, Jasa Trolli, Gallarate, in the Kingdom of Italy, have invented new and useful Improvements in Lamp-Holders of the Edison Type, of which the following is a specification.

The object of the present invention is a lamp-holder of the Edison type which is made of insulating material and in two parts so that it can be readily taken apart, and it serves at the same time as a switch; a considerable, saving of material is therewith obtained and it can be touched without any danger.

'The annexed drawing represents two embodiments of the invention by way of example.

Figure l is an external view of the lampholder in working order.

Fig. 2 is a section thereof to a larger scale.

Fig. 3 shows lamp-holder in plan as seen from the inside of the base-piece.

Fig. 4 is a section showing a modified construction.

The holder comprises two parts made of- In the base-piece wan eccentric hole f is also formed for passage of the see 0nd lead, this hole too being provided with a clamping block g fitted with springing shank; the block g is lodged higher up in the base-piece athan block e-.

The socket or sleeve -b is screwthreaded externally for connection to the base-piece, and internally for receiving the lamp; both the internal screw-threaded surface and the external screw-threaded portion in touch with the base-piece a are lined, galvanically or otherwise, with a metal plating --z', say of copper.

The metal cap of the lamp makes contact with the metal plating ?J, which in its turn is electrically connected to the eccentric block g. The center contact of the lamp butts against the center block eand in this way the lamp filament can be connected to both lead-wires. To interrupt the connection it suflices to slacken the screw-connection between -0; and b.

In the modified construction accordin to Fig. 4 the eccentric hole f is replace by a radial hole -fformed in the side of the projection a, so that also the second wire can be led through the center hole d' and thence, through the side hole to the eccentric block -g-.

aving now fully described my invention what I claim is:

A lamp-holder of the character described comprising a base piece and a socket of insulating material and capable of being screw-threaded into one another, a central inwardly projecting portion on the base piece, the base piece being provided with a central hole and with an eccentric hole, each of said holes bein adapted to be traversed by one of two lead wires, metal blocks each of which are provided with a central opening and with an elastic-slit shank, the shanks of the blocks being tightly fixed in the center and eccentric holes and designed to firmly grip the ends of the respective wires, one of said blocks being adapted to make contact with the center contact of a lamp and a metal plating on the internal head surface and on the internal screw-threaded surface of the socket adapted to make contact with the other block in order to establish an electric contact between said block and the metal ca of a lamp.

In testimony w ereof I aflix my si nature.

ANTONIO PI ZZI. 

